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The gauge is mechanical. Works by the expansion of the ether, so if there is a leak that's the end of that. Usually break when using one insted of two spanners when trying to get it out of the head, This twists the tube which then often cracks/splits/breaks. Repair possible through specialists but not cheap.
This might be of interest. It's probably a version of Jacks 740 fix but uses the original fitting. Even with postage from EU likely cheaper than a repair. Note, you send in your old unit.
http://www.hukebasart.nl/huke/en/?New_product%21
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